Example for Configuring Distributed MAP-E

This section provides an example for configuring the distributed MAP-E function on a device that functions as the MAP-BR and BRAS.

Networking Requirements

In a distributed scenario shown in Figure 1, both the MAP-BR and BRAS reside on router A. The BRAS functions as a DHCPv6 server to deliver MAP addresses and mapping rules to MAP-CEs in DHCPv6 IA_PD mode. Router A also functions as a MAP-BR and resides on the edge of a MAP domain. Router A allows the MAP-CEs to access the public IPv4 network through the IPv6 network that is within the MAP domain. In addition, the MAP-CEs can use each other's public IPv4 address to communicate through the MAP-BR.

Figure 1 Networking diagram for configuring MAP-E

In this example, interface 1 and interface 2 are GE 0/1/8 and GE 0/1/9, respectively. Interface 1 is used in this example.

Prerequisites

The MAP license has been loaded to the MAP-BR, and the MAP function has been activated.
The MAP-BR has at least one interface board that supports the MAP function.

Configuration Roadmap

The configuration roadmap is as follows:

Configure a BR.
Configure BMR rules.
Configure a MAP-E instance and bind the BMR and BR rules to the MAP-E instance.
Configure an IPv6 prefix pool and an IPv6 address pool.

Data Preparation

To complete the configuration, you need the following data:

BR name (br_name), IPv6 address (2001:db8:1124::1), and prefix length (96 bits)
BMR name (bmr_name), IPv6 address (2001:db8:1::1), prefix length (48), IPv4 address (1.1.1.0), mask length (24), EA-length (16), and PSID-offset length (4)
MAP-E instance name (2) and ID (2)
Interface1's IPv6 address (2001:db8:2::1), IPv6 mask length (64 bits), IPv4 address (10.1.1.1), and IPv4 mask length (24 bits)
Interface2's IPv4 address (11.1.1.1) and mask length (24 bits)

Procedure

On the MAP-BR, configure the BR that is the local IPv6 address as the destination address of IPv6 packets sent by MAP-CEs. Set the BR name to br_name, the IPv6 address to 2001:db8:1124::1, and the prefix length to 96.
```
<RouterA> system-view
[~RouterA] br-ipv6-address br_name ipv6-address 2001:db8:1124::1 prefix-length 96
[*RouterA] commit
```
Configure a BMR rule on the MAP-BR to instruct the BRAS to assign IPv6 and IPv4 addresses to MAP-CEs. Configure the BMR to remove the user-side IPv4 address from the IPv6 address and encapsulate IPv6 information into the IPv4 address and port number of the network-side traffic.
```
[~RouterA] map rule bmr_name
[*RouterA-map-rule-bmr_name] rule-prefix 2001:db8:1::1 prefix-length 48 ipv4-prefix 1.1.1.0 prefix-length 24 ea-length 16 psid-offset 4
[*RouterA-map-rule-bmr_name] commit
[~RouterA-map-rule-bmr_name] quit
```
Configure an IPv6 prefix pool and an address pool on the BRAS.
- Configure an IPv6 prefix pool named pre1 and bind it to the BMR rule named bmr_name to allocate PD prefixes to MAP-CEs.
```
[~RouterA] ipv6 prefix pre1 delegation
[*RouterA-ipv6-prefix-pre1] map-rule bmr_name
[*RouterA-ipv6-prefix-pre1] commit
[~RouterA-ipv6-prefix-pre1] quit
```
- Configure an IPv6 address pool named pool1 and bind it to the prefix pool named pre1. Bind the BR name br_name to the IPv6 address pool. Then, the BRAS encapsulates the IPv6 prefix into Option 90 information (OPTION_S46_BR) carried in the IPv6 prefix into the DHCPv6RESPONSE message sent to MAP-CEs.
```
[~RouterA] ipv6 pool pool1 bas delegation
[*RouterA-ipv6-pool-pool1] prefix pre1
[*RouterA-ipv6-pool-pool1] option-s46 br-ipv6-address br_name
[*RouterA-ipv6-pool-pool1] commit
[~RouterA-ipv6-pool-pool1] quit
```
Configure a MAP-E instance on the MAP-BR and bind the configured BR and BMR rules to the MAP-E instance. The BR is used to import the encapsulated traffic of MAP-CEs to an interface board, select the MAP-E instance for conversion, and bind the BMR rule to encapsulate and verify the packets in the instance.
```
[~RouterA] map-e instance 2 id 2
[*RouterA-map-e-instance-2] br-ipv6-address br_name
[*RouterA-map-e-instance-2] map-rule bmr_name
[*RouterA-map-e-instance-2] commit
[~RouterA-map-e-instance-2] quit
```

Configure IP addresses of the user- and network-side interfaces on the device.

[~RouterA] interface GigabitEthernet0/1/8
[~RouterA-GigabitEthernet0/1/8] ipv6 enable
[*RouterA-GigabitEthernet0/1/8] ipv6 address auto link-local
[*RouterA-GigabitEthernet0/1/8] commit
[~RouterA-GigabitEthernet0/1/8] quit
[~RouterA] interface GigabitEthernet0/1/9
[~RouterA-GigabitEthernet0/1/9] ip address 11.1.1.1 24
[*RouterA-GigabitEthernet0/1/9] commit
[~RouterA-GigabitEthernet0/1/9] quit
[~RouterA] quit

Configure a user access domain.

[~RouterA] aaa
[*RouterA-aaa] domain map-e
[*RouterA-aaa-map-t] authentication-scheme default0
[*RouterA-aaa-map-t] accounting-scheme default0
[*RouterA-aaa-map-t] commit
[~RouterA-aaa-map-t] ipv6-pool pool1
[~RouterA-aaa-map-t] quit
[~RouterA-aaa] quit

Configure a DUID for the DHCPv6 server.

[~RouterA] dhcpv6 duid llt
[*RouterA] commit

Configure IPoEv6 access.

[~RouterA] interface GigabitEthernet0/1/8
[*RouterA-GigabitEthernet0/1/8] bas
[*RouterA-GigabitEthernet0/1/8-bas] access-type layer2-subscriber default-domain authentication map-e
[~RouterA-GigabitEthernet0/1/8-bas] authentication-method-ipv6 bind
[*RouterA-GigabitEthernet0/1/8-bas] commit

Router A Configuration File

#
br-ipv6-address br_name ipv6-address 2001:db8:1124::1 prefix-length 96
#
map rule bmr_name
 rule-prefix 2001:db8:1::1 prefix-length 48 ipv4-prefix 1.1.1.0 prefix-length 24 ea-length 16 psid-offset 4
#
map-e instance 2 id 2
 br-ipv6-address br_name
 map-rule bmr_name
#
ipv6 prefix pre1 delegation
 map-rule bmr_name
ipv6 pool pool1 bas delegation
 prefix pre1
 option-s46 br-ipv6-address br_name
#
aaa
 domain map-t
  authentication-scheme default0
  accounting-scheme default0
  ipv6-pool pool1
#
dhcpv6 duid 0001000125a7625df063f9761497
#
interface GigabitEthernet0/1/8
 undo negotiation auto
 undo shutdown
 ipv6 enable
 ipv6 address auto link-local
 bas
  access-type layer2-subscriber default-domain authentication map-t
  authentication-method-ipv6 bind
#
interface GigabitEthernet0/1/9
 undo negotiation auto
 undo shutdown
 control-flap
 ip address 11.1.1.1 255.255.255.0
#
ipv6 route-static 2001:db8:1::1 48 2001:db8:2::1
#